PDF malware analysis — malicious · 083e2984972131fa

MALICIOUS

PDF

223.1 KB Created: 2008-11-20 09:16:01 +05:30 Authoring application: Acrobat PDFMaker 7.0.7 for Word (via Acrobat Distiller 7.0.5 (Windows))

MD5: 315f87657f2dc2e5e9d42ef99b45f21e SHA-1: 45770e30d52a4ac01879cfcd67c8b6151af10248 SHA-256: 083e2984972131fad4cb5cd3f8f4210208ed829ddfa94a83ad960a36be61fd2b

550 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.007 JavaScript T1566.001 Spearphishing Attachment

This PDF document contains embedded JavaScript that exploits multiple known vulnerabilities in Adobe Reader, specifically CVE-2009-0927 (Collab.getIcon) and CVE-2008-2992 (util.printf). The JavaScript is obfuscated and appears to be designed to download and execute a second-stage payload, as indicated by the 'generic stage recovery' heuristics and the presence of shellcode. The primary attack vector is likely spearphishing attachment.

Machine Learning

Nyx PDF Classifier malicious score 0.8997

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.
ClamAV: Pdf.Exploit.Agent-35646 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-35646
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.
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.
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/pdf/1.3/
- 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/pdfx/1.3/

Extracted artifacts 11

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0347_000.js` `07b39465638b36bde3c07ff455eb653151c7e164200c36e48bd09274fbef265e`	pdf-javascript-stream	PDF /JS object 347 at offset 0x3748F	3693 bytes
Detection ClamAV: Pdf.Exploit.Agent-35646 Obfuscation or payload: likely Carved artifact contains 6 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`generic_stage_recovery_000.js` `469026e8df60200368392eba4e719cced62d7e78ad3934aeff72eeeedcf49466`	deobfuscated-js	generic stage recovery split-literal-normalize from JavaScript object 347 at offset 0x3748F	3681 bytes
Detection ClamAV: Pdf.Exploit.Agent-35646 Obfuscation or payload: likely Carved artifact contains 6 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`generic_stage_recovery_001.js` `8404fed16bbae565af272bb2ba73f49b5807aca629a8ba5c87f1bf94a94660d6`	deobfuscated-js	generic stage recovery percent-decode from JavaScript object 347 at offset 0x3748F	3613 bytes
Detection ClamAV: Pdf.Exploit.Agent-35646 Obfuscation or payload: likely Carved artifact contains 6 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`generic_stage_recovery_002.js` `c3cc796599638e503db61203ad5edc8156a683f9af01cc36368e2a10f0f96cb5`	deobfuscated-js	generic stage recovery marker-XY-to-%u from JavaScript object 347 at offset 0x3748F	3680 bytes
Detection ClamAV: Pdf.Exploit.Agent-35646 Obfuscation or payload: likely Carved artifact contains 6 eval/decoder/string-building token(s).
`generic_stage_recovery_003.js` `a651819d7b3fbf19071b64340a59c6e61c57059e03c3777504715009baefd69a`	deobfuscated-js	generic stage recovery percent-decode from JavaScript object 347 at offset 0x3748F	3600 bytes
Detection ClamAV: Pdf.Exploit.Agent-35646 Obfuscation or payload: likely Carved artifact contains 6 eval/decoder/string-building token(s).
`generic_stage_recovery_004.js` `a462c3fab1f1f79ac843e6cef58396f14264d47466924ac89ea7784a3cb203a1`	deobfuscated-js	generic stage recovery split-literal-normalize -> percent-decode from JavaScript object 347 at offset 0x3748F	3597 bytes
Detection ClamAV: Pdf.Exploit.Agent-35646 Obfuscation or payload: likely Carved artifact contains 6 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`generic_stage_recovery_005.js` `acb41941b7aeeae23054b8edc3def1a561f68feb8009d84fd3ce97d60f3a81ef`	deobfuscated-js	generic stage recovery split-literal-normalize -> marker-XY-to-%u from JavaScript object 347 at offset 0x3748F	3668 bytes
Detection ClamAV: Pdf.Exploit.Agent-35646 Obfuscation or payload: likely Carved artifact contains 6 eval/decoder/string-building token(s).
`generic_stage_recovery_006.js` `702e17253b5925b0de7bf6e9f7e4aba9a05a4963250154d161cc92af4b884fec`	deobfuscated-js	generic stage recovery split-literal-normalize -> percent-decode from JavaScript object 347 at offset 0x3748F	3584 bytes
Detection ClamAV: Pdf.Exploit.Agent-35646 Obfuscation or payload: likely Carved artifact contains 6 eval/decoder/string-building token(s).
`generic_stage_recovery_007.js` `d94a41f96efeb42a9140a15c2bb24ef71ff06a4ef15be8486d24aba5a7a3a3af`	deobfuscated-js	generic stage recovery percent-decode -> split-literal-normalize from JavaScript object 347 at offset 0x3748F	3601 bytes
Detection ClamAV: Pdf.Exploit.Agent-35646 Obfuscation or payload: likely Carved artifact contains 6 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`generic_stage_recovery_008.js` `74daf9db592a57c0f2f0e70dd94379e6b8162b920541b77b8c9452848f2b2249`	deobfuscated-js	generic stage recovery percent-decode -> split-literal-normalize from JavaScript object 347 at offset 0x3748F	3588 bytes
Detection ClamAV: Pdf.Exploit.Agent-35646 Obfuscation or payload: likely Carved artifact contains 6 eval/decoder/string-building token(s).
`generic_stage_recovery_009.js` `2c084bbeb135dc4362ed1fa9cee15f5f5ec67337fa779cc16e010636c085d182`	deobfuscated-js	generic stage recovery split-literal-normalize -> percent-decode -> percent-decode from JavaScript object 347 at offset 0x3748F	3580 bytes
Detection ClamAV: Pdf.Exploit.Agent-35646 Obfuscation or payload: likely Carved artifact contains 6 eval/decoder/string-building token(s).

Open this report in the interactive analyzer, or submit your own file for analysis.