PDF malware analysis — malicious · 1dea74a846e51df7

MALICIOUS

PDF

12.1 KB

MD5: 22b8ec2ecbe24db8d2b19a86e2cc7400 SHA-1: 6c664d823ca41c31f9d88889251f713b5953f11c SHA-256: 1dea74a846e51df7a01f81315e402e6d1ebad495ed5193c8a3cb27abbf90e5d6

128 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript T1204.002 Malicious Link

The PDF file contains embedded JavaScript that leverages the CVE-2007-5659 vulnerability (Collab.collectEmailInfo). The critical heuristic firing indicates that this exploit is used to decode and execute obfuscated JavaScript, which is likely responsible for downloading and executing a second-stage payload. The presence of multiple deobfuscated JavaScript files further supports this analysis.

Heuristics 6

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. (identified after JavaScript deobfuscation)
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
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.
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)
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.

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0005_000.js` `4fe50cfcdf04f0cd22476408596a884b04b36651498705e21419a905647abdda`	pdf-javascript-stream	PDF /JS object 5 at offset 0x107	312 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_000.js` `e1b5ca2e00313f019048c794825e20530d7f97336509cafc5021e59a0012ba62`	deobfuscated-js	z-percent hex-pair decoded JavaScript at offset 0x30D	5051 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_001.js` `7d5e8f24ea6414909a52610305d232a901aef27cb61fcae6b4af613bc507456a`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x30D	12181 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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