PDF malware analysis — malicious · fb31ab3116ca71ab

MALICIOUS

PDF

9.4 KB

MD5: e23749a14348d3d40ddfb5c5febc9d1f SHA-1: 15cf322d24e3634ce6ffc30da4dffd54444f27ac SHA-256: fb31ab3116ca71ab7954c45efe5f4eb31ad8bc1fd80ec1182087be66587d7c5e

186 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link T1204.002 Malicious File

The PDF file contains heavily obfuscated JavaScript, indicated by multiple heuristic firings including 'PDF_JAVASCRIPT', 'PDF_JS', and 'PDF_ANNOT_SUBJECT_CALLEE_HEX_STAGER'. The critical 'CVE_2007_5659' firing specifically points to the exploitation of a vulnerability related to 'Collab.collectEmailInfo' to execute decoded JavaScript. This JavaScript is likely responsible for downloading and executing a second-stage payload, as suggested by the presence of large deobfuscated JS files and the general nature of such exploits.

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` `be0a3248e0e1bc8276d86ec514ae703fe102f5b3c9ae882dff4c004e4993309a`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14A	5118 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` `e4e9ad32106f3b2c4ff5563ae1029d6c7b8e67c7c8a5f90a90e629b3114b445b`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2CC	12112 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` `71ce9f41fa59d4751e2733635255de621c47fb3b924ae87987121bd14a7a5256`	deobfuscated-js	PDF JavaScript deobfuscation pass	74267 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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