PDF malware analysis — malicious · 38eb68f390e85b53

MALICIOUS

PDF

4.8 KB Created: 2010-04-21 04:29:03 Authoring application: Xawefamozma (via Mmopekiqaneji)

MD5: f6b3b258576cf19f4635fa8904a5ed25 SHA-1: 30ddbf8def121b23fef6e4c9a0e83a4fb6d30c55 SHA-256: 38eb68f390e85b53e55793ea4a89b1e6a91edbac9d121116b527285ad81f1240

398 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF file contains multiple critical heuristic firings indicating the exploitation of several CVEs related to JavaScript execution within PDFs. Specifically, it uses a page-word XOR decoding stager to evaluate JavaScript, which is a common technique for dropper malware. The ClamAV detection of 'Pdf.Dropper.Agent-7250099-0' further supports this. The primary attack vector involves exploiting these vulnerabilities to achieve arbitrary code execution, likely for downloading additional malicious content.

Heuristics 10

media.newPlayer — CVE-2009-4324 critical CVE exact CVE_2009_4324

PDF JavaScript calls media.newPlayer — CVE-2009-4324 is a use-after-free in Adobe Reader's multimedia plugin triggered by media.newPlayer(). Actively exploited as a zero-day in December 2009. (identified after JavaScript deobfuscation)
Collab.getIcon — CVE-2009-0927 critical CVE exact CVE_2009_0927

PDF JavaScript calls Collab.getIcon — CVE-2009-0927 is a stack buffer overflow in Adobe Reader triggered by Collab.getIcon() with a crafted argument. Allows arbitrary code execution. (identified after JavaScript deobfuscation)
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)
util.printf — CVE-2008-2992 critical CVE exact CVE_2008_2992

PDF JavaScript calls util.printf() — CVE-2008-2992 is a stack buffer overflow in Adobe Reader triggered by a long format-specifier argument. Widely exploited in the wild after disclosure. (identified after JavaScript deobfuscation)
ClamAV: Pdf.Dropper.Agent-7250099-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-7250099-0
OpenAction trigger high PDF_OPENACTION

PDF has an /OpenAction — code runs automatically when opened
Page-word XOR JavaScript eval stager high PDF_PAGE_WORD_XOR_EVAL_STAGER

PDF JavaScript enumerates rendered page words with getPageNthWord/getPageNumWords, extracts encoded byte fragments, XOR-decodes the stage with char-code helpers, and evals the result. This is an old exploit-kit staging pattern and is not normal document JavaScript.
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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0011_000.js` `9551cb29c148355e2c0a4889694047d07101ab5c93bed2d1b18aa9c461a0e7a4`	pdf-javascript-stream	PDF /JS object 11 at offset 0xCF5	1301 bytes
`page_word_xor_stage_000.js` `253c624b4e8ff276519651ccfd4ce3d96e6d664af4a3b7a486d0a3631065c0f4`	deobfuscated-js	page-word XOR decoded JavaScript (decompressed, key=0xEC) at offset 0x244	3230 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s).

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