PDF malware analysis — malicious · 32fa68cd590503c0

MALICIOUS

PDF

12.1 KB

MD5: ad5f8a7de0df742ba4e8957ab267d2a7 SHA-1: 516ffc1e9629106f3441e18386c78d40578134a7 SHA-256: 32fa68cd590503c003ab8dfe494871f852bbd7b38a9934ea1b78075e08dae4ea

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 which is associated with CVE-2007-5659. This exploit is used to decode and execute a hex-encoded stager. The ClamAV detection 'Pdf.Exploit.Agent-36063' further confirms the malicious nature of the file. The primary attack vector appears to be the exploitation of a known PDF vulnerability to run arbitrary code.

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` `f4edab5b5e057bafa784c05bbe73ee10e6ccf69b8036028dfcfc40ed1fd23de1`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14A	5172 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` `1c626fc9d94851f1a7c2eb192bd956cf65334297a7d640935a4210e02aca007b`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2D6	12259 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` `39068f905f7a1b34ba8c1ac8d06d2789e88eaf9dd68bd0978b47a3d497491a66`	deobfuscated-js	PDF JavaScript deobfuscation pass	76376 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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