PDF malware analysis — malicious · 4e50862e02b18e6a

MALICIOUS

PDF

12.2 KB

MD5: fbaea07432c60be8f24ad126add3364b SHA-1: f739488740db9004b9e0c0f1a74fff31c19d3a6e SHA-256: 4e50862e02b18e6a3134a8ae58e65dec4ee933d83a787c4f1457d3a2d2d6e8a4

186 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious Link

The PDF file contains embedded JavaScript that is heavily obfuscated, indicating an attempt to conceal malicious activity. Heuristics indicate the use of CVE-2007-5659, specifically the 'collab.collectEmailInfo' method, which is known to be used for launching JavaScript stagers. The extracted JavaScript files, particularly 'annotation_subject_callee_hex_stage_000.js', are likely responsible for downloading and executing a secondary payload, a common technique for initial access.

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` `b8a60a88b897964866a36d85595a84e3931b98d8920b68c4e8154402c95b8bb6`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14A	5201 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` `c2f38dae4fd33a7f11203f8bf64af96f7b3cea8fc6631da3414fe4df9b919490`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2D6	12442 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` `935c2b915cfdb9c3dfef4b208cc2208395e72d24253e8016e6a28ed6a91a5acb`	deobfuscated-js	PDF JavaScript deobfuscation pass	75270 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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