PDF / .TXT malware analysis — malicious · 336d8c0e0533b732

MALICIOUS

PDF / .TXT

12.1 KB

MD5: cc5cb507a62a79f996557c24a8f2727e SHA-1: 353c1f690b71febe766cd0be3634f7f6cb5a86ab SHA-256: 336d8c0e0533b7324fbe94b30c7daf5478e59084275391dba0ae019e39973e51

146 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF file contains embedded JavaScript that exploits CVE-2007-5659 via the 'collab.collectEmailInfo' function. Static analysis indicates this JavaScript is responsible for downloading and executing a second-stage payload. The presence of multiple deobfuscated JavaScript files and ClamAV detection further supports its malicious nature. The exact second-stage payload and its delivery mechanism are not fully detailed in the provided evidence, hence the 'unknown family' classification.

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)
ClamAV: Pdf.Exploit.Agent-35903 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-35903
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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0007_000.js` `860eae5f96eb426380281c575a089242b50523bbb4bbb8dd765e582cd9c07d2e`	pdf-javascript-stream	PDF /JS object 7 at offset 0x19D	294 bytes
`legacy_pdfkit_stage_000.js` `2630d59c016166f9b8d114d0e9d86bc0ba079785f49bb76d6e63a1c1c638a942`	deobfuscated-js	z-percent hex-pair decoded JavaScript at offset 0x2E8	5144 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` `b714e39ae328712d8699eb716a96c839bb397bc439d8ed93df03b8433aefcc2a`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2E8	12207 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).

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