PDF malware analysis — malicious · a0161e0687b33211

MALICIOUS

PDF

9.5 KB

MD5: 67544145ea1785402950e8e34f83b20a SHA-1: b4879203534db6de9baeee09cd5196131bae7468 SHA-256: a0161e0687b33211cd80f64b1a514b76b5b4030d9c633692dc760fa3f887fa3d

186 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF document contains obfuscated JavaScript, identified by multiple heuristics including PDF_JAVASCRIPT, PDF_JS, and PDF_ANNOT_SUBJECT_CALLEE_HEX_STAGER. The critical CVE_2007_5659 heuristic indicates the use of a known vulnerability to execute this script. The script is likely designed to download and execute a second-stage payload, as suggested by the presence of deobfuscated JavaScript files and the ClamAV detection for obfuscated objects. The exact payload and its destination are not fully discernible from the provided evidence, hence the confidence is not 100%.

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 3

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` `4250e0e2f80d86a75b3564072e34d12c5c4a23d5b3f4b5b6836e215c554b51c2`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14A	5123 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).
`deobfuscated.js` `dfae54be0342c122aa3a8e4aec1961cd344deb22e5d252776a494b0aaebe0470`	deobfuscated-js	PDF JavaScript deobfuscation pass	72843 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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