PDF malware analysis — malicious · 324add4ff0f1270b

MALICIOUS

PDF

12.4 KB

MD5: f82aad7d855e1d8298bfb5f6a61db1b1 SHA-1: 1bcde5200d8f2f3e0ddce29561f031c6da6f6ac2 SHA-256: 324add4ff0f1270be46d62acfd3e8c8230bcd6d21667da08406bec377fa898c2

186 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The PDF file contains embedded JavaScript, triggered by the 'CVE_2007_5659' heuristic which indicates exploitation of the Collab.collectEmailInfo method. This JavaScript acts as a stager, decoding a hex-encoded payload. The primary function of this stager is to download and execute a secondary payload, as suggested by the large size of the deobfuscated JavaScript files and the 'PDF_JAVASCRIPT' and 'PDF_JS' firings. The 'CLAMAV_DETECTION' heuristic further confirms its malicious nature.

Heuristics 7

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-36063 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-36063
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` `eb39e2de4dbbc100de6d3e30aa43ff78fa075618862ba1ebba5151ea3a3b848d`	pdf-javascript-stream	PDF /JS object 7 at offset 0x19D	273 bytes
`annotation_subject_callee_hex_stage_000.js` `1983cac416c19ca79ba5a9748afe8d3640d7e9c64b2b0107e7970d7d0e920112`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14A	5290 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` `c38dcbf60844dc34eec76f44cf5000881c1f4ed345e4c614825622f036ca95f7`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2D6	12523 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` `891b3caaa692517721c15f44e3af32741fd8a395244edc19aefc1df175ca0f0f`	deobfuscated-js	PDF JavaScript deobfuscation pass	78506 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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