PDF malware analysis — malicious · 4e6219dc6ff47c4f

MALICIOUS

PDF

9.8 KB

MD5: f7859d837980acc7ffc402c643ff288c SHA-1: d1a88a397e09473727f5b75a3787e71d03024566 SHA-256: 4e6219dc6ff47c4fc09f399cefe3abc6bc0cfa37c7a24527edc9c1f79ce34cb4

126 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript, identified as a stager for CVE-2007-5659. The critical heuristic 'CVE_2007_5659: Collab.collectEmailInfo' indicates the exploitation of this vulnerability. The embedded JavaScript is designed to decode and execute a payload, likely for downloading and running a second-stage malicious file. The presence of multiple deobfuscated JavaScript files suggests a complex execution chain.

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` `1db67e62b411ff05cee93c19b2db053ada9df9579c574946bde9482a46a2bb9f`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14A	5321 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` `d91c64b331577ef525b229e3aa0488133f1a2010b370b26ebfeaf1fcbe595592`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2D0	12687 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` `e797a1876c9eb2a2a184e73f49ad27ccb7966fafb65ade7a5113164c57eb4d59`	deobfuscated-js	PDF JavaScript deobfuscation pass	47966 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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