PDF malware analysis — malicious · 94c8638c44ccca6b

MALICIOUS

PDF

44.5 KB

MD5: a4e1b958f863a9bda07da9ee75a6587f SHA-1: 4d51a425bc4d5ab85e3bf0dc2ec496a126915e1a SHA-256: 94c8638c44ccca6b43e66762b21eee6ac0354f7ed0e00344794ee64373423261

166 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF file contains multiple JavaScript streams and exploits the CVE-2007-5659 vulnerability via the 'collab.collectEmailInfo' function. This indicates a sophisticated stager designed to download and execute further malicious content. The presence of U3D content and multiple deobfuscated JavaScript files suggests a multi-stage attack. The exact payload and download URL could not be fully reconstructed due to obfuscation and truncation.

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)
U3D/3D content in PDF — Adobe Reader 3D parser CVE-family indicator high CVE related PDF_U3D_CVE_RELATED

PDF contains U3D (Universal 3D) or 3D annotation content — CVE-2011-2462 and CVE-2009-3953 are critical vulnerabilities in Adobe Reader's U3D processing that allow arbitrary code execution. U3D content in PDFs is extremely rare in normal documents.
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 5

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0009_000.js` `35536860df4016ec3bb72c6ba20d15719a83250cd5ef7568b1faf5e782e24fd7`	pdf-javascript-stream	PDF /JS object 9 at offset 0x43A9	439 bytes
`annotation_subject_callee_hex_stage_000.js` `f884bf661279a963800394cd144fb6b57785398b572aa80708b85a45455dea8d`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x1B70	5536 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_000.js` `bbef55515957ea04ef23ccbfecaf4384f0c22c122b476b3dd1d0c37bb826626c`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x1BC4	12571 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`deobfuscated.js` `74ad050be29973b63d92423ff18dfb6846eb7b83c11098680dd359405cdb4084`	deobfuscated-js	PDF JavaScript deobfuscation pass	224810 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 long base64-like blob(s).
`u3d_00_off000045e4.bin` `fb27c6f6ffe2b08a88f79f344ef3cb4f85460ac81a062194b6fd84ab6e48b628`	pdf-3d-stream	PDF U3D 3D stream at offset 0x45E4	28021 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.79, consistent with packed or encrypted content.

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