PDF malware analysis — malicious · c34b3c09bb320e3f

MALICIOUS

PDF

12.0 KB

MD5: ec346fe9c21aff1e1276305a8fbf2a71 SHA-1: ff3597080d3918e8d6b939703d0405a40b61b37a SHA-256: c34b3c09bb320e3fc7b605d6c77d13b2aab10609301781f3f985bf8028dda4c5

186 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1204.002 Malicious JavaScript T1059.007 JavaScript/JScript

The PDF file contains embedded JavaScript, triggered by the CVE-2007-5659 vulnerability related to the Collab.collectEmailInfo function. The analysis recovered multiple JavaScript streams, including a large deobfuscated one, indicating complex malicious code execution. The ClamAV detection of 'Pdf.Exploit.Agent-36063' further confirms its malicious nature. The primary attack vector appears to be exploiting a PDF reader vulnerability to run obfuscated JavaScript, likely to download and execute a secondary 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.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` `bbcd226ab093de2e2e920d3ed59ceeb6ffb9fbdb54cb7722fcc36179736a15b9`	deobfuscated-js	annotation-subject callee-key decoded JavaScript at offset 0x14A	5111 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` `dd0cf2729d5ea135c98ca170a8d6d78a7df20be5637dcb8d1d04f3e132cb38fa`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2D6	12218 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` `6f2aed8639a3586fc5a3011c85c0888835bfe60ab263d24a18aa3a860a7d9e4d`	deobfuscated-js	PDF JavaScript deobfuscation pass	69407 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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