PDF malware analysis — malicious · f1e1307a73e88252

MALICIOUS

PDF

9.4 KB

MD5: e316bf0fcf7b3f7a4b08a9243dd0dbbd SHA-1: c5c7cb55afeb004ab82f7ffba874e32096077ffd SHA-256: f1e1307a73e8825220f7d32176a1eb98948a3622abd98904f9d9114ec8492006

188 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript, identified by multiple heuristics including PDF_JAVASCRIPT and PDF_JS. A critical heuristic, CVE_2007_5659, indicates the use of a known vulnerability (Collab.collectEmailInfo) to execute a JavaScript stager. This stager is responsible for downloading and executing a second-stage payload. The ClamAV detection of 'Pdf.Dropper.Agent-7322952-0' further confirms its malicious nature as a dropper.

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.Dropper.Agent-7322952-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-7322952-0
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` `bee8d0945b4e9cdf1889c53ecedfabd959c06a1daf8c494417c5a2b03db9b7cd`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14A	5058 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` `fbe3ed0bf1ecb0099abc69ded085499561a3f5a21e70ef0f4e08b33993def295`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2CC	12070 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` `06b52477eae5abbcda3acfb1ac3f1844fa5ff596fea91d0e82f587d57552a8c8`	deobfuscated-js	PDF JavaScript deobfuscation pass	70797 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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