PDF malware analysis — malicious · f590ba3e315b5b15

MALICIOUS

PDF

2.0 KB

MD5: 5ac15755fd37883a3dfd56cbdfaa8d7c SHA-1: b98cb41c1ff01053bfd8ff850e453e246ac52786 SHA-256: f590ba3e315b5b15c99d866dc8f65b7be6cb5ab6d8c5507bfcf4a97fe4cff6e1

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1204.001 Malicious Link T1071.001 Web Protocols

The PDF file contains embedded JavaScript that utilizes `eval()` and `unescape()` functions, indicating obfuscation. The critical heuristic firing for CVE-2007-5659 (Collab.collectEmailInfo) strongly suggests exploitation of this known vulnerability. The JavaScript is likely designed to download and execute a secondary payload, which is a common technique for initial access.

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)
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (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_obj111611_000.js` `433d6141b5fc932a52d94051061c1f7566cbde37bb51ce636d76e20ed4ab2bf6`	pdf-javascript-stream	PDF /JS object 111611 at offset 0x6D9	297 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_000.js` `6edc5fc12b13f08264c4e36e9c73eabe032aa2decab32f725ff7adbbe62df169`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x189	2640 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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