PDF malware analysis — malicious · 8854fbab5b5c76fd

MALICIOUS

PDF

12.2 KB

MD5: cef00a170980e5d1c94c99d020430abd SHA-1: 3187ef89bf0e9cb6556ed3ce576333bb3ef8521e SHA-256: 8854fbab5b5c76fd7baedb25f78fda72d0efdd0b399155acfac08a80f11e2376

186 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The PDF file contains multiple embedded JavaScript streams, with critical heuristics indicating the use of CVE-2007-5659 (Collab.collectEmailInfo) and a hex-encoded stager. The primary attack vector appears to be exploiting a vulnerability in PDF viewers to execute obfuscated JavaScript. This script is responsible for downloading and executing a secondary payload, as indicated by the presence of large deobfuscated JavaScript files and the ClamAV detection for obfuscated PDF content. The specific exploit used is CVE-2007-5659, which is a known vulnerability for PDF exploitation.

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
Annotation subject callee-key hex JavaScript stager high PDF_ANNOT_SUBJECT_CALLEE_HEX_STAGER

PDF JavaScript uses syncAnnotScan()/getAnnots() to read an indirect annotation /Subject stream, percent-decodes it through marker replacement, then uses a callee.toString()-derived key to decode and eval the final 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.
syncAnnotScan annotation-staging primitive low PDF_FOXIT_SYNCANNOTSCAN

PDF JavaScript calls syncAnnotScan() — a no-op annotation-enumeration primitive used by exploit-kit JavaScript to stage payload reads from annotation /Subject fields before eval(). Not a vulnerable sink itself; rarely seen in legitimate PDFs. (matched in decompressed 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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0007_000.js` `11b03694c4e705ab29873cc5e2c55342ee498b376ac2dc5f05ce17018ef44c38`	pdf-javascript-stream	PDF /JS object 7 at offset 0x19D	264 bytes
`annotation_subject_callee_hex_stage_000.js` `a1789749f92c51f1837e0cb66b719308e11d97fbe6b7e71e2f73c4e4d2ec6d78`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14A	5282 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` `e5fda3eb6b30ec72b187292a3785590ac6c51dc8db34bb04a5b21d5d36f8a8ac`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2CF	12414 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).
`deobfuscated.js` `5df40aa99ac74fde60e07968305fc68b8186cfb6fa4a27302b8829f1317d2ef7`	deobfuscated-js	PDF JavaScript deobfuscation pass	80614 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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