PDF malware analysis — malicious · df881eb67af93669

MALICIOUS

PDF

9.5 KB

MD5: 1316029bcf41cefddb3a4d25f0ad4a64 SHA-1: 60d28feeae19a6a278d62974f6f213433e53006e SHA-256: df881eb67af93669e44993b5d125f9d9093dfd864d38deb100ec558aecd28c00

186 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains multiple embedded JavaScript streams and triggers heuristics related to known PDF exploits, specifically CVE-2007-5659 (Collab.collectEmailInfo). The critical heuristic 'CVE_2007_5659' indicates the use of a JavaScript stager within an annotation subject, which decodes and evaluates a hex-encoded payload. This suggests the document is designed to exploit a vulnerability to execute arbitrary code. No specific malware family was identified, but the technique points to a malicious downloader or exploit delivery.

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: Heuristics.PDF.ObfuscatedNameObject critical CLAMAV_DETECTION

ClamAV detected this file as malware: Heuristics.PDF.ObfuscatedNameObject
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` `11b03694c4e705ab29873cc5e2c55342ee498b376ac2dc5f05ce17018ef44c38`	pdf-javascript-stream	PDF /JS object 7 at offset 0x19D	264 bytes
`annotation_subject_callee_hex_stage_000.js` `8a50be8c96f71382558cc7701e67c4bdb62bb474eab861122efe9df31ae3a4a5`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14A	5082 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` `e931d59e12239ec9b8b1ed0ae612805eb4fd8411d3c2389d460080c723f4fbac`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2CC	12172 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` `5f570a53938970ac119452ca34389be5a1ba135f7422bae1a09c9c2c19bfc4dc`	deobfuscated-js	PDF JavaScript deobfuscation pass	67736 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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