PDF malware analysis — malicious · 3c653dff79caf23c

MALICIOUS

PDF

13.0 KB

MD5: 840c4208ca7eb1b95ee1a8888bca51d9 SHA-1: 02baa4cbc50bbb5f139d789bd206e769951497a0 SHA-256: 3c653dff79caf23c8384f4aee5b2921b7b6c6e196d36e2a3731b14c65e8be018

186 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript T1204.001 Malicious Link T1204.002 Malicious File

The PDF file contains obfuscated JavaScript, identified as a binary-XOR stager, which exploits CVE-2007-5659 (Collab.collectEmailInfo). This exploit is designed to execute the embedded JavaScript, likely to download and run a second-stage payload. The ClamAV heuristic also flags the file as malicious due to obfuscated objects.

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)
ClamAV: Heuristics.PDF.ObfuscatedNameObject critical CLAMAV_DETECTION

ClamAV detected this file as malware: Heuristics.PDF.ObfuscatedNameObject
Binary-XOR JavaScript stager high PDF_BINARY_XOR_JS_STAGER

PDF JavaScript stores viewer-version payload branches as long binary digit strings, XORs each bit pair, converts 8-bit chunks with String.fromCharCode, and evals the recovered exploit stage.
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_obj0049_000.js` `147841d8ee7ef95684b41acb2d95068cb8b5f61f1a6bed587acfd77372da0268`	pdf-javascript-stream	PDF /JS object 49 at offset 0xA	76936 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 6 long base64-like blob(s).
`binary_xor_stage_000.js` `b7ec10223b4afb20862c809bad8793ad94a0fe98b6f55a03a270b4b7ca901249`	deobfuscated-js	binary-XOR decoded JavaScript at offset 0x464	1276 bytes

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