PDF malware analysis — malicious · be5784e445c1d04d

MALICIOUS

PDF

3.5 KB Created: 2008-31-20 53:85:00 Authoring application: Scribus 1.3.3.12 (via Scribus PDF Library 1.3.3.12)

MD5: fac412fbb10b263726138443d3751377 SHA-1: 6278b31ab2323bfbdc97c3a915b776809e22cb8d SHA-256: be5784e445c1d04d88016959595884530bb7785cb7403f5cc61500952c2b01f2

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious Link

The PDF file contains embedded JavaScript triggered by the OpenAction, which is a common technique for exploiting vulnerabilities. The heuristics indicate the use of eval() and String.fromCharCode, along with a specific CVE-2007-5659 exploit targeting Collab.collectEmailInfo. This suggests the script is designed to deobfuscate and execute malicious code, likely downloading a second-stage payload. The extracted JavaScript files confirm the presence of obfuscated code and potential exploit attempts.

Heuristics 7

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)
OpenAction trigger high PDF_OPENACTION

PDF has an /OpenAction — code runs automatically when opened
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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0013_001.js` `995135b0da83fdb6bd13a9a97df53f251de10bca4ed7276632d1a8d718de70bf`	pdf-javascript-stream	PDF /JS object 13 at offset 0x3D7	13289 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).
`numeric_charcode_stage_000.js` `f17440e8405c3f19961f4206ec25a4b89ce5f70c527c3c3d3d675590d6da1d7e`	deobfuscated-js	numeric char-code string decoded JavaScript at offset 0x445	4032 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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