PDF malware analysis — malicious · 1a392361a2b49c7c

MALICIOUS

PDF

9.2 KB

MD5: ddcc5ba5ec311d25c0fad80a30c39d6b SHA-1: b330c6b0f8be58317be7e3c4cc6d708e0aacec0c SHA-256: 1a392361a2b49c7c74d7f9add024df1476233a1475f7a5b290f0b405afde2fb4

186 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The PDF file contains multiple embedded JavaScript streams, with critical heuristics indicating the use of CVE-2007-5659 (Collab.collectEmailInfo) and obfuscated JavaScript stagers. The primary heuristic points to a hex-decoded JavaScript stager embedded within an annotation subject, which is then evaluated. This suggests the document is designed to download and execute a second-stage payload. The presence of multiple deobfuscated JavaScript files further supports this. The family is unknown due to the generic nature of the exploit.

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` `a5c371e02ec68738f990907b64fa29dd5915a9b3493272fb33af6d732336995f`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14A	4958 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` `8d7542905741aaa2a87c6b5622e40e0783a3a498f0615cfa6cf15cfefe2f9807`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2CC	11998 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` `0bb8f911a416bbe98d319ad4e036909e4066e9615268046ffbbc625f2b5a1d53`	deobfuscated-js	PDF JavaScript deobfuscation pass	66480 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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