PDF malware analysis — malicious · 6928fd90a4d91bf6

MALICIOUS

PDF

119.3 KB Created: 2008-02-14 17:33:19 -03:00 Authoring application: Acrobat Editor 8.0 (via Adobe Acrobat 8.1.0)

MD5: f7db3edad8d7ceca5d8c90fb6e2961ae SHA-1: 8c712fa93eee8c47a095033e96c9ab63bb243948 SHA-256: 6928fd90a4d91bf64d4e04a85d9b622b8e3f1fd1e5cf04056f4c5123fd117db7

492 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF file contains embedded JavaScript that exploits multiple Adobe Reader vulnerabilities, specifically CVE-2008-2992 (util.printf) and CVE-2009-0927 (Collab.getIcon). The JavaScript is heavily obfuscated but appears to be designed to download and execute a secondary payload. The presence of multiple critical heuristic firings related to JavaScript exploits and exploit kits strongly indicates malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 0.9998

Heuristics 13

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)
util.printf — CVE-2008-2992 critical CVE exact CVE_2008_2992

PDF JavaScript calls util.printf() — CVE-2008-2992 is a stack buffer overflow in Adobe Reader triggered by a long format-specifier argument. Widely exploited in the wild after disclosure. (matched in decompressed stream)
Pidief-style multi-CVE JavaScript dispatcher critical CVE likely PDF_PIDIEF_MULTI_CVE_DISPATCH

A single JavaScript body branches on app.viewerVersion and invokes two or more of the canonical Reader sinks (Collab.collectEmailInfo, Collab.getIcon, util.printf with a field-width format string). This is the 2009-2010 Pidief.J multi-exploit landing template: a per-version dispatcher that fires the matching CVE chain for whichever Reader version opens the file.
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.
Secondary embedded PDF body has suspicious static findings critical POLYGLOT_CHILD_PDF_STATIC_TRIAGE

A valid PDF body was found at a nonzero offset inside another container and its carved contents matched PDF exploit or lure heuristics. This catches polyglots where the top-level magic routes to ZIP/OLE while a PDF reader or downstream parser opens the hidden PDF payload.
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.
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.w3.org/1999/02/22-rdf-syntax-ns#
- http://ns.adobe.com/xap/1.0/
- http://purl.org/dc/elements/1.1/
- http://ns.adobe.com/xap/1.0/mm/
- http://ns.adobe.com/pdf/1.3/

Extracted artifacts 14

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0036_000.js` `b4993e91e3537c20453a482e216008e5472bfc616c403a148cb25519eff3f56c`	pdf-javascript-stream	PDF /JS object 36 at offset 0x2125	8192 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 2 long base64-like blob(s).
`stream_010_off0001b82c.bin` `f4228d847f2d1bb84b8afe1c4b447b8acb5d8e7d501ef2a33ec0de606d60a15c`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x1B82C	1000 bytes
`generic_stage_recovery_000.js` `a191fa676fcfdbd86915ccd473611dcce8c3ee4f53839b654c78fd984cfb0189`	deobfuscated-js	generic stage recovery null-collapse from JavaScript object 36 at offset 0x2125	3990 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 2 long base64-like blob(s).
`generic_stage_recovery_001.js` `435f16d8116dc08bf877132a91b54016fbad7836eba0d5462fdbcfd63bc82343`	deobfuscated-js	generic stage recovery marker-XX-to-%u from JavaScript object 36 at offset 0x2125	7753 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`generic_stage_recovery_002.js` `148a2cf84a2bdfaa8a699429064676b8bf6731c76dd9b7643db20b0728d55a23`	deobfuscated-js	generic stage recovery percent-decode from JavaScript object 36 at offset 0x2125	7751 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`generic_stage_recovery_003.js` `0d1b7a50a9199e1a287fc41d6d02be136547372bbcc65ba100dd440364192eb4`	deobfuscated-js	generic stage recovery marker-MM-to-%u from JavaScript object 36 at offset 0x2125	6133 bytes
`generic_stage_recovery_004.js` `1d4f4c5b57e18fdd202405911aaf8476a40318192ffa2e6140d5887ac98642ee`	deobfuscated-js	generic stage recovery null-collapse -> marker-XX-to-%u from JavaScript object 36 at offset 0x2125	3551 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`generic_stage_recovery_005.js` `9a596957bc2f0bfea668e0b847913f664caaeaf7badaa44a3bc8ef79556654b8`	deobfuscated-js	generic stage recovery null-collapse -> percent-decode from JavaScript object 36 at offset 0x2125	3549 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`generic_stage_recovery_006.js` `270fb1f54ca6061ea281ed2df288f542a72975cae621c63ed5c8c4a1bc481810`	deobfuscated-js	generic stage recovery null-collapse -> marker-MM-to-%u from JavaScript object 36 at offset 0x2125	1931 bytes
`generic_stage_recovery_007.js` `e3f2686dc69f7aab16bd0e18237f3a140eb84f408fab0c04ea5aaa72042539eb`	deobfuscated-js	generic stage recovery marker-XX-to-%u -> marker-MM-to-%u from JavaScript object 36 at offset 0x2125	6133 bytes
`generic_stage_recovery_008.js` `239411abbabfed2649f34e0baed0ca72ce45262879c9ae92d8f24d545d46e7ff`	deobfuscated-js	generic stage recovery marker-XX-to-%u -> percent-decode from JavaScript object 36 at offset 0x2125	6131 bytes
`generic_stage_recovery_009.js` `eac6888dcd325e303155bf27d5cc963a7c037796af358edec635966a1fd312e1`	deobfuscated-js	generic stage recovery null-collapse -> marker-XX-to-%u -> marker-MM-to-%u from JavaScript object 36 at offset 0x2125	1931 bytes
`generic_stage_recovery_010.js` `8d57f130e2ce2256551d599b3b3f968143504243af914b07913e23471937c68b`	deobfuscated-js	generic stage recovery null-collapse -> marker-XX-to-%u -> percent-decode from JavaScript object 36 at offset 0x2125	1929 bytes
`polyglot_child_pdf_off0001a67f.pdf` `3cc64327e87dcec17ce6f87981e2ea7575fbd4154f1011b1f6d58ccdecc1c500`	polyglot-child-pdf	Secondary PDF body inside pdf container at offset 0x1A67F	14054 bytes

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