PDF malware analysis — malicious · 143b32601f3b2551

MALICIOUS

PDF

3.44 MB Created: 2008-02-27 16:58:09 +08:00 Authoring application: PScript5.dll Version 5.2 (via Acrobat Distiller 6.0.1 (Windows))

MD5: a72c58269eeee1a54050b04ec2cc4700 SHA-1: b30e4be0959f857ca07d57837934c39847c67283 SHA-256: 143b32601f3b25514ca0cfbf19e75d8032cfca8d50a19d2bbc70af80084971b4

556 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF contains multiple critical heuristic firings indicating exploitation of known Adobe Reader vulnerabilities (CVE-2009-4324, CVE-2009-0927, CVE-2007-5659) through embedded JavaScript. The JavaScript code, particularly the `eval()` and `unescape()` calls, is designed to deobfuscate and execute a malicious payload. This exploit cluster strongly suggests the document's purpose is to compromise the user's system by leveraging these vulnerabilities.

Machine Learning

Nyx PDF Classifier malicious score 0.9791

Heuristics 17

media.newPlayer — CVE-2009-4324 critical CVE exact CVE_2009_4324

PDF JavaScript calls media.newPlayer — CVE-2009-4324 is a use-after-free in Adobe Reader's multimedia plugin triggered by media.newPlayer(). Actively exploited as a zero-day in December 2009. (matched in decompressed stream)
Collab.getIcon — CVE-2009-0927 critical CVE exact CVE_2009_0927

PDF JavaScript calls Collab.getIcon — CVE-2009-0927 is a stack buffer overflow in Adobe Reader triggered by Collab.getIcon() with a crafted argument. Allows arbitrary code execution. (matched in decompressed stream)
Collab.collectEmailInfo — CVE-2007-5659 critical CVE exact CVE_2007_5659

PDF JavaScript calls Collab.collectEmailInfo — CVE-2007-5659 is a buffer overflow in Adobe Reader triggered by a long argument or heap-sprayed message field passed to Collab.collectEmailInfo(). Part of a series of Acrobat JS API exploits. (matched in decompressed stream)
PDF JavaScript exploit cluster critical PDF_JS_EXPLOIT_CLUSTER

PDF combines an executable JavaScript/action surface with exploit staging indicators such as eval/unescape/fromCharCode, XFA script content, or a related CVE pattern. Benign form JavaScript remains low-severity, but this correlated cluster is high-confidence malicious behavior.
Multi-CVE Adobe Reader JavaScript exploit kit critical PDF_ADOBE_READER_MULTI_CVE_JS_KIT

One recovered JavaScript stage contains multiple version-gated Adobe Reader exploit branches. This is stronger evidence than independent API keywords: the PDF is selecting old Reader vulnerabilities by viewer version and running heap-sprayed Acrobat JavaScript exploit paths.
ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV

ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (matched inside decoded stream)
Generic recovered JavaScript exploit stage high PDF_GENERIC_STAGE_RECOVERY

Bounded static stage recovery exposed hidden JavaScript through generic transforms such as null-byte collapse, percent decoding, marker replacement, arithmetic character codes, fromCharCode, numeric arrays, numeric-array minus-key decoders, alphabet-index arrays, /Producer half-difference metadata arrays, hex literals, marker-stripped Base64 literals, custom 6-bit XOR table decoders, or repeated-marker hex carriers. This rule is emitted only when the recovered stage contains exploit-like Acrobat JavaScript or shellcode markers.
JavaScript action low PDF_JAVASCRIPT

PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
Embedded file low PDF_EMBEDDED

PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
XFA form low PDF_XFA

PDF uses XML Forms Architecture — can contain script logic
String.fromCharCode low PDF_FROMCHARCODE

String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape rules. (matched inside decoded stream)
Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL

The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE

One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
URL http://www.pdf-repair.com
- http://www.pdf-repair.com)/Producer(Advanced
- http://www.pdf-repair.com)/ModDate(D:20100331095227+08
- http://www.pdf-repair.com)/ModDate(D:20100331095400+08
- http://www.pdf-repair.com)/ModDate(D:20100331100222+08
- http://www.pdf-repair.com)/ModDate(D:20100331100427+08
- http://www.w3.org/1999/02/22-rdf-syntax-ns#
- http://ns.adobe.com/pdf/1.3/
- http://ns.adobe.com/xap/1.0/
- http://ns.adobe.com/xap/1.0/mm/
- http://purl.org/dc/elements/1.1/
- http://www.w3.org/1999/xhtml
- http://www.xfa.org/schema/xfa-data/1.0/

Extracted artifacts 15

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0039_000.js` `479709d781d3e822daffb67b734746d6560150ce79b6e5e1c0a6bc6750c65f27`	pdf-javascript-stream	PDF /JS object 39 at offset 0x368F17	24715 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`javascript_obj0052_001.js` `c917b33e0b828ad59a6d239ec06fb8c323d17273aa37747a1f4041c436ef4b17`	pdf-javascript-stream	PDF /JS object 52 at offset 0x36C82E	7515 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 25 eval/decoder/string-building token(s).
`generic_stage_recovery_000.js` `ac1193fbfef7e653f2145890a293c08f22dc2e7a1179bb2a8723ff2ecf90307e`	deobfuscated-js	generic stage recovery fromCharCode-args from JavaScript object 39 at offset 0x368F17	7513 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 25 eval/decoder/string-building token(s).
`generic_stage_recovery_001.js` `8e9de13832805893c17c363767427975c4af91b5c324e9a75f2f633bd4237550`	deobfuscated-js	generic stage recovery percent-decode from JavaScript object 39 at offset 0x368F17	7505 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 25 eval/decoder/string-building token(s).
`generic_stage_recovery_002.js` `8e2eb2eea26be86895cd9226bc5c3bf611583c0e3a30eeab84af693fdf85eaa3`	deobfuscated-js	generic stage recovery split-literal-normalize from combined JavaScript objects at offset 0x368F17	32093 bytes
Detection ClamAV: Pdf.Exploit.Agent-35646 Obfuscation or payload: likely Carved artifact contains 27 eval/decoder/string-building token(s).
`generic_stage_recovery_003.js` `ec5cd180f37eac87515f20fbae42d8307abfb92135dda295fff0620287ea3295`	deobfuscated-js	generic stage recovery percent-decode from combined JavaScript objects at offset 0x368F17	32223 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 26 eval/decoder/string-building token(s).
`generic_stage_recovery_004.js` `42c9f1642d817edff53c8fc403ed2931f2834594a7ee63f2f1c56ad0f9696588`	deobfuscated-js	generic stage recovery split-literal-normalize from JavaScript object 52 at offset 0x36C82E	7377 bytes
Detection ClamAV: Pdf.Exploit.Agent-35646 Obfuscation or payload: likely Carved artifact contains 26 eval/decoder/string-building token(s).
`generic_stage_recovery_005.js` `dea79717468ea352f14e78d746cb18aedc24a866023f8a48951af7ed3602f4b4`	deobfuscated-js	generic stage recovery percent-decode from JavaScript object 52 at offset 0x36C82E	7507 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 25 eval/decoder/string-building token(s).
`generic_stage_recovery_006.js` `f64d03eb009b6dbce28f16fbf85bf844a879f4633261711bb473bfb6b158087e`	deobfuscated-js	generic stage recovery fromCharCode-args from decompressed stream at 0x36AB1E at offset 0x36AB1E	7536 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 25 eval/decoder/string-building token(s).
`generic_stage_recovery_007.js` `16159565e23c35c86196605bf105005549d44344be0ff3c9c446ac49a9ba8255`	deobfuscated-js	generic stage recovery percent-decode from decompressed stream at 0x36AB1E at offset 0x36AB1E	7528 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 25 eval/decoder/string-building token(s).
`generic_stage_recovery_008.js` `09f198aa6d21fb54cf2a583e8cb70df01c9dd30d46e4209a92aff6b8d323730b`	deobfuscated-js	generic stage recovery fromCharCode-args from decompressed stream at 0x36E20A at offset 0x36E20A	7463 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 6 eval/decoder/string-building token(s).
`generic_stage_recovery_009.js` `0e11a81b7e365098619c453cb98bb51c62e3955018c99690782ce540014a1dfd`	deobfuscated-js	generic stage recovery percent-decode from decompressed stream at 0x36E20A at offset 0x36E20A	7455 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 6 eval/decoder/string-building token(s).
`generic_stage_recovery_010.js` `7e5b51fda2964a6520818836528c41cd546f4cd2bca3bbd2424d3812270c67bc`	deobfuscated-js	generic stage recovery fromCharCode-args from decompressed stream at 0x36FF1A at offset 0x36FF1A	7454 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 6 eval/decoder/string-building token(s).
`generic_stage_recovery_011.js` `13510c29ab6d8ef3d93233c0d3e05035ae258b39a91e243d85c90e74c6c5e40e`	deobfuscated-js	generic stage recovery percent-decode from decompressed stream at 0x36FF1A at offset 0x36FF1A	7446 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 6 eval/decoder/string-building token(s).
`combined_document_js_000.js` `f1a6f8d9a7dc4a7721fdc65db4e8e76e20332478e292ba774caa3bd1f6f2163a`	deobfuscated-js	combined document JavaScript streams at offset 0x368F17	32231 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 26 eval/decoder/string-building token(s).

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