PDF malware analysis — malicious · c8a6a01319c1a007

MALICIOUS

PDF

12.2 KB

MD5: deb19a6fcb4e14641e2efa4a6a88a474 SHA-1: 815b984ade4abd6a73dc3c00ec902c9cff9d7522 SHA-256: c8a6a01319c1a0077ea7cbffbba89918bfaeb080d28c24d216d6f31cc6513ef3

186 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

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 JavaScript is heavily obfuscated but appears to be designed to download and execute a second-stage payload. The presence of multiple deobfuscated JavaScript files suggests a complex, multi-stage attack. No specific family could be confidently identified.

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` `0f5670321d20b7d3ba3f6edb451c675164936ad2925834a8a0723a82926546d9`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14A	5228 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` `36511b90de3947b4c07aa04df8a37675e5a8b18752de26a9169a657efdaae454`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2D6	12421 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` `8f1ef318f6d9c8895b8fff89e457e63983ab9266a29743d4d8e58fb1991710d5`	deobfuscated-js	PDF JavaScript deobfuscation pass	78847 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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