PDF malware analysis — malicious · 41af0c498464c9d8

MALICIOUS

PDF

12.9 KB

MD5: 57c53c5a5688beeed58089793743e6b9 SHA-1: f839b78bdd3cc6b732f62328d98d454489dcde33 SHA-256: 41af0c498464c9d821714db707a0badaa0a0b5cbdc3a713ba20594d53ee3eacc

198 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File: Malicious File

The PDF contains embedded JavaScript, triggered by the 'collab.collectEmailInfo' function, which is a known vulnerability (CVE-2007-5659). The heuristics indicate this function is used as an eval stager to launch further malicious code. The presence of deobfuscated JavaScript files suggests a downloader or dropper functionality, aiming to fetch and execute additional malware. The ClamAV detection further confirms its malicious nature.

Heuristics 6

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)
Annotation subject percent-decoding eval stager critical PDF_ANNOT_SUBJECT_MARKER_EVAL_STAGER

OpenAction JavaScript forces annotation enumeration, reads an annotation /Subject payload with getAnnots(), rewrites marker bytes into percent escapes, decodes it with unescape(), and dispatches it through eval. This is a high-confidence exploit-kit staging pattern. It is intentionally not mapped to CVE-2009-1492 unless getAnnots() itself carries the crafted integer or long argument shape for that vulnerability.
ClamAV: Pdf.Dropper.Agent-7254272-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-7254272-0
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.
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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0007_000.js` `1847af0a099665b6ac45af66402e56ed64237a1b287618ee3d6643267fda6f35`	pdf-javascript-stream	PDF /JS object 7 at offset 0x19D	343 bytes
`legacy_pdfkit_stage_000.js` `131c6ec4cb4d5c7e5ac8638292c25bdc46ae24fc67f6888ac2f6c3f3795577e4`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2F0	12576 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`legacy_pdfkit_stage_001.js` `5d1f57f8a48dd54497dab72ed5fee1c94e0451c18cbf7534ed00aa749dd5dffc`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2F0	5237 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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