PDF malware analysis — malicious · 3581ca85cbf05698

MALICIOUS

PDF

11.9 KB

MD5: 9bfa9d8a7d9a2768c6bdb4855cd30d63 SHA-1: 676e43aba27d08b7a6aa6b49338a3b4e347ede9e SHA-256: 3581ca85cbf05698a7046a542faee5f6b82398c941f628be1c1ecddfe5e558da

186 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF document contains embedded JavaScript, specifically leveraging the 'Collab.collectEmailInfo' method to exploit CVE-2007-5659. This exploit is used to decode and execute a hex-encoded stager, which is then further deobfuscated. The primary function appears to be the execution of a malicious payload via JavaScript, as indicated by multiple heuristic firings related to PDF JavaScript exploits and stagers. The ClamAV detection 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` `88a760a010cc9efbfbf9b76f05e08f7b2ef23cbbec9bf703d25e4e4a4527c9af`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14A	5110 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` `3972efc7bd061efd9b0868b7312c0cc9c5ad57b9f8bd7113a0ad3e3327643c60`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2D6	12117 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` `802d4f190ec03feb362f13f270a4eb06bd0dc3d276211492c9911dea5d5e4228`	deobfuscated-js	PDF JavaScript deobfuscation pass	72623 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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