PDF malware analysis — malicious · 3976461ed359fdd7

MALICIOUS

PDF

9.8 KB

MD5: a9cdba028eabaef7d1ce38361e45e90a SHA-1: b11ae26448d014daefd5af2c1a348360f02a8375 SHA-256: 3976461ed359fdd710ec1c9f1d54fcc34ec122208b7d92788fe6917d0e56d957

186 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF document contains obfuscated JavaScript, detected by multiple heuristics including critical firings for CVE-2007-5659 and ClamAV's Heuristics.PDF.ObfuscatedNameObject. The JavaScript is likely responsible for downloading and executing a second-stage payload, as indicated by the 'callee-key hex stager' heuristic. The specific exploit used is CVE-2007-5659, leveraging the Collab.collectEmailInfo function.

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` `b1252d3bd5010de3be7dec33b45117d0cbb550a19f5cb3b2227b5330f3d9a951`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14A	5350 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` `79b38cf112e83d00b1c4014eafdf62e37f6bb67e048649a0c58bf453275bcc8c`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2CC	12601 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` `fcb6512f8bddcee486b9aaefce4ba06b3cbfa6488ab77b62c3238715e66ee2be`	deobfuscated-js	PDF JavaScript deobfuscation pass	73300 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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