PDF malware analysis — malicious · c86ee1f653f893cf

MALICIOUS

PDF

3.5 KB Created: 2008-07-26 19:43:58 Authoring application: Scribus 1.3.3.12 (via Scribus PDF Library 1.3.3.12)

MD5: e651000d3885cfd93fd005cb23c2c92c SHA-1: 52dd30208ce3d280278d72069a46ca9c9a0dd37e SHA-256: c86ee1f653f893cf53876fa9ee174759c81e30ebf28e875a3e58658176ef87b2

128 Risk Score

Malware Insights

MITRE ATT&CK

T1204.001 Malicious Link T1059.001 PowerShell T1059.003 Windows Command Shell T1059.007 JavaScript

The PDF file contains embedded JavaScript that utilizes the `Collab.collectEmailInfo` function, which is known to be vulnerable to CVE-2007-5659. The JavaScript is obfuscated and appears to be designed to download and execute a second-stage payload. The `eval()` function and `String.fromCharCode` are used, indicating dynamic code execution. The presence of custom Base64 decoding further suggests an attempt to hide malicious code.

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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0013_000.js` `962d2edea6425978a4428c448b8920b1c789d6ec0cbbe6f6ebf5b0597d60a549`	pdf-javascript-stream	PDF /JS object 13 at offset 0x3CE	3446 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`acroform_b64_00.js` `2d4e05b41297819a457bbcfbf77d8a975e08650505661911c46d4ce4456161b6`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x40B	2217 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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