PDF malware analysis — malicious · bf82dbfee34438e3

MALICIOUS

PDF

9.6 KB

MD5: af1238998662d09c3a73dc6f44989e49 SHA-1: 6ed7656965d81d7ef62e0a1ef871501ce285629e SHA-256: bf82dbfee34438e39d025b482c3468e8046a21dbcaaa76814d8511ef68bc8594

126 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF sample contains multiple embedded JavaScript streams, with the critical CVE_2007_5659 heuristic indicating the exploitation of a known vulnerability (Collab.collectEmailInfo) to stage and execute JavaScript. The deobfuscated JavaScript files suggest a complex decoding and execution process, likely intended to download and run a further payload. The presence of multiple deobfuscated JS files indicates a multi-stage attack. No specific family could be identified.

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` `fef2748da0963bfedf978a2147d952194f3e3f8618af7f124375150c0751de6c`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14A	5209 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` `c1738f02ca1caf6df7c3cf86a3b388d11dabf862adeb6a45bf6c0f22dd751ca5`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2D0	12313 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` `eb2d23e6b3d814b746215b0696d75e7a02da1432b148d0739c1a3020d0704552`	deobfuscated-js	PDF JavaScript deobfuscation pass	42670 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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