PDF malware analysis — malicious · 7f91cdb126e12944

MALICIOUS

PDF

11.6 KB

MD5: e25c2071b9933519b1306e56522bd2c0 SHA-1: fc07fdaebae03dc10241f76725f5c84ad290feb0 SHA-256: 7f91cdb126e129441365dde7e5da1f2a7cbdb7e9d905b9381d328713776f3aa5

186 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF document contains embedded JavaScript, identified by multiple heuristics including PDF_JAVASCRIPT and PDF_JS. A critical heuristic, CVE_2007_5659, specifically indicates the exploitation of a vulnerability related to the `Collab.collectEmailInfo` function within PDF annotations. This function is used to stage and execute JavaScript, which is then decoded and evaluated. The presence of ClamAV detection for 'Pdf.Exploit.Agent-36063' further confirms its malicious nature. The primary attack vector appears to be the exploitation of a known PDF vulnerability to run obfuscated JavaScript, likely to download and execute further malicious code.

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.Exploit.Agent-36063 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-36063
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` `eb39e2de4dbbc100de6d3e30aa43ff78fa075618862ba1ebba5151ea3a3b848d`	pdf-javascript-stream	PDF /JS object 7 at offset 0x19D	273 bytes
`annotation_subject_callee_hex_stage_000.js` `c1a34d756350156571d3c9c36cd8fd0701759807a0ce965589a9b68edeb285c4`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14A	4898 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` `b2bf42255f79a27e3e64fa005ad91cf4c3057f919ae54ed5f28387e469df3058`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2D6	11743 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` `327f8a67703a36fe2624013eb73e8491cdc9404513ac1fc998a55c0a2e04cd1c`	deobfuscated-js	PDF JavaScript deobfuscation pass	70529 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

Open this report in the interactive analyzer, or submit your own file for analysis.