PDF malware analysis — malicious · 1f2ce6f07c1924ed

MALICIOUS

PDF

9.7 KB

MD5: e3a29937915aded4c7b06a22b8aaea3c SHA-1: bac14ce6c3862c5b0d67e4518d9f037b71b7ea05 SHA-256: 1f2ce6f07c1924ed621f0cbd210ca2db2c48aa537dff08390d8c8d8c722c6567

188 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains multiple embedded JavaScript streams, with critical heuristics indicating the use of CVE-2007-5659 (Collab.collectEmailInfo) and a hex-stager for JavaScript execution. The ClamAV detection 'Pdf.Dropper.Agent-7237177-0' further confirms its malicious nature. The embedded scripts are heavily obfuscated, but the overall pattern suggests a dropper designed to download and execute a second-stage payload.

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-7237177-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-7237177-0
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` `b371b95b27dd43ed7eb0bb33e2e9c7b14ea5d1e18b766f0153290aa30e4a9097`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14A	5209 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` `3952623b53a527a88ddfb68e7746579b079800b11a79fd4d48bd9cde060b2e00`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2CC	12265 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` `d4f6d8add80797863bc360699acdfe2eae7a48b12a5d9ed1085c41810f168f58`	deobfuscated-js	PDF JavaScript deobfuscation pass	70777 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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