PDF malware analysis — malicious · 40f0fa575cacdc54

MALICIOUS

PDF

9.8 KB

MD5: be2baf3dda574bf7afb77ef0598f6cad SHA-1: fb35a4a3046d96ceff28eba8ab8ae853e342cf86 SHA-256: 40f0fa575cacdc541088000e36acf5a7efc678d9cee44c2b8fe88885cad89a5e

126 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF document contains embedded JavaScript that is heavily obfuscated. Heuristics indicate the use of CVE-2007-5659, specifically leveraging the `Collab.collectEmailInfo` function to stage and execute JavaScript. The extracted JavaScript files, particularly `annotation_subject_callee_hex_stage_000.js` and `deobfuscated.js`, are likely responsible for decoding and executing the final payload. The exact nature of the payload is not fully discernible due to obfuscation, but the techniques used point to a downloader or initial access mechanism.

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)
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` `9f17df95bc71874fe0f2dcb9f0e8f529cdb3604910d27079f2fbde52cabda2a8`	pdf-javascript-stream	PDF /JS object 7 at offset 0x19B	256 bytes
`annotation_subject_callee_hex_stage_000.js` `ac710402f9f0f20d9d6b073a027f3442b35538cba3485ff7e6b14c331b11895b`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14A	5348 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` `fc61627c8f6ce5ed02ac8e6784b94e0ba56011e0b2fa4954f684998354201710`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2D0	12731 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` `b750458d67578852f452112b9fd26d4448c2b233a988b8ed8f46e932767b6a0a`	deobfuscated-js	PDF JavaScript deobfuscation pass	46775 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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