PDF malware analysis — malicious · b04b1f7b1f9a906e

MALICIOUS

PDF

44.4 KB

MD5: 7fc18dbe204e341dd3f744f34ce75e53 SHA-1: f3bcf043dfa018a8c6cb9661e4fb629b06a52d2f SHA-256: b04b1f7b1f9a906e178d01bfdb443f949f82352eb924be1bae7b1dbf4d871c39

166 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File: User Execution: Malicious File T1059.001 Command and Scripting Interpreter: JavaScript

The PDF file contains embedded JavaScript and exploits CVE-2007-5659, a known vulnerability in Adobe Reader related to the `Collab.collectEmailInfo` function. The heuristic `PDF_ANNOT_SUBJECT_CALLEE_HEX_STAGER` indicates that the annotation subject is used to stage JavaScript, which is then decoded and evaluated. This suggests the file's primary purpose is to leverage this exploit to execute arbitrary code. No specific malware family could be identified.

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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0009_000.js` `ba166ba339dfad11a60ec0a4cfc84970f4749dbf3d24fbdcc597fb4e53d521f8`	pdf-javascript-stream	PDF /JS object 9 at offset 0x430F	492 bytes
`annotation_subject_callee_hex_stage_000.js` `ee8a92f50ccf6c56114923e2048ef92f54ef2b341e350322babb66de595c0630`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x1B3C	5455 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).
`deobfuscated.js` `5d9d473d5e0ca5438cb98195d432f1a37a58cb3c9f2b49d33da8af782dc0fa46`	deobfuscated-js	PDF JavaScript deobfuscation pass	219559 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 long base64-like blob(s).
`u3d_00_off00004557.bin` `fb27c6f6ffe2b08a88f79f344ef3cb4f85460ac81a062194b6fd84ab6e48b628`	pdf-3d-stream	PDF U3D 3D stream at offset 0x4557	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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