PDF malware analysis — malicious · 1cb43154533b63f9

MALICIOUS

PDF

9.1 KB

MD5: bd601b7981336f817dbe58d7d2c4ebd5 SHA-1: df9de248c9a3be6feabef7583c2f8742d9453d85 SHA-256: 1cb43154533b63f9b5930d59d1934d666eb176892a1d04f1f2b2d22c519bf870

126 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The PDF file contains embedded JavaScript that is heavily obfuscated and designed to act as a stager. The critical heuristic 'CVE_2007_5659: Collab.collectEmailInfo' indicates the exploitation of a known vulnerability in Adobe Reader. The deobfuscated JavaScript likely downloads and executes a second-stage payload, a common technique for initial access and further infection.

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` `1f00b4ff9ced4611182a41a34b65963026a92aaf136813282e171ffba74a5583`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14A	4947 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` `878b40521a5c009efd43453c2e65d09a73e2d8f7a221963a034cf01f016d5584`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2D0	11779 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` `7237a47dea120bf30fad85aadb6848918a19816b33f5b321a68c0acee6ab5dac`	deobfuscated-js	PDF JavaScript deobfuscation pass	66034 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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